Knob-lock



P- W5. TUCKER.

, KNOB LOOK;

Patented Apr. 2, 1 895.

amounted W M JO %0av6 /i bvwoge9 1'5 t scribed 'class, means whereby the combina- 2 represents a drical portion,

, lowing is a specification. I I

'c'ess, 3, and on the other.

UNIT D STATES PATENT" 1 ILLIA TUQKER,"-OF INDIANAPOLIS, INDIANA.

KNOB sPncInIcAIrIoN forming part of Letters Patent No, 536,666, dated. April 2, ss5.

fApplicationfiled Novmber lZ, 3 894- Serial No. 528.514- i'No model.)

To all"who m it mag concern:- Be it known that 1, WILLIAM T KER, acitizen of the United States, residing at Indian-- 'apolis, in the county of Marion and State of Indiana, have invented new, and useful Improvements in Knob-Locks, of which the fol- My invention relates; to an i knob locks. Y

The object of my improvement is to provide' a combination-lock for fastening a knob mprovement in shank into or out of engagement with the operating mechanism of a lock or latch.

Another object of ny improvement is to provide in a combination-lock of the detion may b'e-easily worked or set by thesense of touch alone.

' The-accompanying drawings illustrate my .20 t

invention. I

Figure 1 represents a .longitudinal ,section showing thealock in position on a door. Fig. front elevation of the lock. Fig. 3 represents a rear elevation, the back plate having been removed. v In the drawings, '2,i dicate's a flat cylindrical casing-having in one side a circular re-- side a hollow hub, 4, which forms a bearing for the cylindrical knob-shank, 5, which is adapted to turn and to. slide longitudinally in said hub. Arranged concentrcially about the hub are a series of shortshafts, 6,each having-a cylin- ,7, a squared portion, 8, and a radial arm, 9. The cylindrical portion of said. shafts is mounted in a bearingtormed in the front of casingfl', whilet-he squared portion projects into the recess 3. Each of the shafts 6 i provided with a circular disk, 10 which is mounted on the squared portion of the shaft so as to turn therewith,- and is held in place by a washer, 11, and capscrew, 12. I

The arrangement of the disks 10. is such that the edge of each will project into a circumferential groove 20, formed in the knob-shank.

,Each of the disks is cut awayat the edge, as

at 13, Fig. 3, so as to clear the knobshank when that edge of the disk is-turned-toward ing 2, and projecting therefrom; are a series of shortstudslt. ,Said studs are so arranged 6,,so that (relatively mined by turning the shaft 6 so that its arm 9 will register with one of the adjacent studs,

the, position of either-of the disks,

- 'In operation, the knob-shank?) being out shown in Fig. 1, is prevented from slidinglonof the disks 10 with the groove in the knobfreelyin the hub ,4,'butcannot be used to operate the, latch mechanism. By turning shafts 6 until the cut away portion of each of the disks is presentedvtoward the shank, the

engagement with the spindle 16, or itsequivalent latch mechanism, so-that, upon then turning the knob-shank, the latch may then be operated and the door opened. If 'it is deof engagement, one of the shafts is turned so as to bring its disk into engagement with the g'roove21, in the knob-shank. It is obvious that, each of the shafts being arrangedso as studs which indicate theposition of the disks being raised from. the surrounding surface, cthe combination-of the lock may be worked,

or set, by the sense of touch only. tate the operation of the look by sight, each of the studs 14 is provided on its face'wi'th a distinguishing mark, as a letter .of the alphabet. I claim. asmy invention-,

1. In a knob-lock, the combination of the knob-shank having acirciimferential groove and-mounted in a casing. so as to turn and to slide longitudinally therein, a series of shafts to the knob-shank,';inay be deter-' The inner end of the'knOb-shetnk is provided witha squared recess, 15,0requi-valent '60 l7, s ecured to the inner surface I gitudinally by the engagement of one or more as to register with the arms 9, ofi the shafts 7 of engage'tnentwith the latch mechanism, as

shank. Inthispos'itiou the knob-shank turns shank is then free to slide longitudinally into 8c siredto hold the knob-shank in this position 8 5 to be separately operated, and eaclr'having,

upon its outer end, a radial arm 9, and-the TO facilimounted in bearings formed in the casing and surrounding said shank, each of said shafts being provided, on its inner end, with a disk adapted to engage said groove in the knobshank; and having a cut away portion which may be turned so as to clear the knob-shank, substantially as set forth, and means for turning said shaft, all arranged to co-operate with each other and with a lock or latch mech= anism, substantially as set forth.

2. In a knob-lock, the combination of the casing having a central hub, the knob-shank arranged to turn and to slide longitudinally in said hub, the series of shafts mounted in said casing and surrounding said knob'shank, tumblers secured to each of said shafts and arranged to be thrown into and out of engagement with the knobshank by the turning of the shafts, so as to prevenfi'the longitudinal movement of the knob-shank but not interfering with its turning, radial arms or pointers on the outer ends of,the shafts, and

a series of raised studs projecting from the front of the casing and arranged to register with said arms or pointers,.all arranged to co-operate with each other and with a latch or lock mechanism, substantially as set forth.

3. In a combination lock, the combination v0t a casing, a movablepart which is to be locked in position, a series of tumbler-shafts grouped about said movable part tumblers secured to each of said shafts and adapted to independently lock the movable part, arms secured to the outer ends of the shafts and studs projecting from the surface of the-casing and arranged to register. with said arms, whereby the position of the tumblersmay be determined by'the sense f t'o'ucha loh g substantially'as se i u I I WIL'LI AM KE Witnesses=' l H. P. H001 V M. HOOD- 

